Think of white blood cells as your immunity cells. In a sense, they are continually at war. They flow through your bloodstream to battle viruses, bacteria, and other foreign invaders that threaten your health.

Red blood cells play an important role in your health by carrying fresh oxygen all over the body.

Giving sweets, chips, or soda as a reward often leads to children’s overeating foods that are high in sugar, fat, and empty calories. Worse, it interferes with kids’ natural ability to regulate their eating, and it encourages them to eat when they’re not hungry to reward themselves.

Research suggests children with ADHD are more likely to have sleep disorders. These include insomnia, daytime sleepiness, and restless leg disorders.

Epididymitis is an inflammation or infection of the epididymis. This is a thin, coiled tube that sits on top of a male testicle. In younger boys, this condition can be caused by a urinary tract infection. In older boys and teens, it's often caused by a sexually transmitted infection (STI).

Scrotal swelling is a common problem in baby boys and young boys. It can have many causes. These are often divided into painless and painful scrotal swelling.

Roundworm infection is a type of parasitic illness. This is an illness in which an organism lives inside the body of another creature. The worms live and grow inside the body and may cause symptoms.

Internal abdominal injuries from blunt trauma are serious injuries that occur when the body hits or collides with a large object. These types of injuries are most common in contact sports like football, ice hockey, soccer, and lacrosse.

Stem cells are special human cells that have the ability to develop into many different cell types, from muscle cells to brain cells. In some cases, they also have the ability to repair damaged tissues.

If 1 of your blood vessels gets damaged, it sends out signals that are picked up by platelets. The platelets then rush to the site of damage and form a plug, or clot, to repair the damage.